Malicious PDF — malware analysis report

Static analysis result for SHA-256 540e96f3c4ae6e3a…

MALICIOUS

PDF

64.8 KB Created: 2020-11-10 04:11:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 66740418685d2f0f0786560a6021bc22 SHA-1: 1dab5c692c5675fba89da1329acd38b1cc4179fe SHA-256: 540e96f3c4ae6e3a686fa0feb4b31ce532a7b075fb0c23a99f1b1dae3efc1cb0
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic indicating a link farm, with one external URI pointing to 'https://trafficel.ru/strik?keyword=learning+to+fly+lyrics+az'. This suggests the document is designed to redirect users to potentially malicious or spam content. ClamAV detection and ML classification further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafficel.ru/strik?keyword=learning+to+fly+lyrics+az PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380379/normal_5f908599948ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370087/normal_5f99f47acd20d.pdfIn PDF document text
    • https://jopalezaleloloj.weebly.com/uploads/1/3/1/3/131380469/9347405.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/ligole/what_school_supplies_for_5th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a80da71-c8dd-4185-9a83-e008c450160a/paint_tool_sai_1.2.5_full_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36e2bb2d-14c7-447d-9209-362472c1b828/27768422168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e4795d8-8ad0-49cb-9cb2-9cfcc84552b8/13006475056.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2422a2c6-6179-4455-82f1-7e9fba75f643/80131005219.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce45fccd-5378-49f9-b282-0909e840fe9f/14771309714.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fef9ccd-bd6f-4aa1-ab82-fb4ed2a20ea1/35074572846.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea03404b-503e-4981-b9ab-2cd51672bf89/89926013252.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/suparatopej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/050fa8fa-ab0b-455a-8fba-d6aad944f366/3859927099.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BA 4928 bytes
SHA-256: 51c1d964ad03af5ab50c9dd0058657d63a5062d2c3d44d5d79003264c33665ca
font_01_sfnt_off0000c598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC598 11192 bytes
SHA-256: 9e02c41bb51407360dd9dfdb078806817501b528d664c06d9b4f75793b09a6cc
font_02_sfnt_off0000e8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C9 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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